1/* 2 * Serial Attached SCSI (SAS) Transport Layer initialization 3 * 4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved. 5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> 6 * 7 * This file is licensed under GPLv2. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of the 12 * License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 22 * USA 23 * 24 */ 25 26#include <linux/module.h> 27#include <linux/slab.h> 28#include <linux/init.h> 29#include <linux/device.h> 30#include <linux/spinlock.h> 31#include <scsi/scsi_host.h> 32#include <scsi/scsi_device.h> 33#include <scsi/scsi_transport.h> 34#include <scsi/scsi_transport_sas.h> 35 36#include "sas_internal.h" 37 38#include "../scsi_sas_internal.h" 39 40struct kmem_cache *sas_task_cache; 41 42/*------------ SAS addr hash -----------*/ 43void sas_hash_addr(u8 *hashed, const u8 *sas_addr) 44{ 45 const u32 poly = 0x00DB2777; 46 u32 r = 0; 47 int i; 48 49 for (i = 0; i < 8; i++) { 50 int b; 51 for (b = 7; b >= 0; b--) { 52 r <<= 1; 53 if ((1 << b) & sas_addr[i]) { 54 if (!(r & 0x01000000)) 55 r ^= poly; 56 } else if (r & 0x01000000) 57 r ^= poly; 58 } 59 } 60 61 hashed[0] = (r >> 16) & 0xFF; 62 hashed[1] = (r >> 8) & 0xFF ; 63 hashed[2] = r & 0xFF; 64} 65 66 67/* ---------- HA events ---------- */ 68 69void sas_hae_reset(struct work_struct *work) 70{ 71 struct sas_ha_event *ev = 72 container_of(work, struct sas_ha_event, work); 73 struct sas_ha_struct *ha = ev->ha; 74 75 sas_begin_event(HAE_RESET, &ha->event_lock, 76 &ha->pending); 77} 78 79int sas_register_ha(struct sas_ha_struct *sas_ha) 80{ 81 int error = 0; 82 83 spin_lock_init(&sas_ha->phy_port_lock); 84 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); 85 86 if (sas_ha->lldd_queue_size == 0) 87 sas_ha->lldd_queue_size = 1; 88 else if (sas_ha->lldd_queue_size == -1) 89 sas_ha->lldd_queue_size = 128; /* Sanity */ 90 91 sas_ha->state = SAS_HA_REGISTERED; 92 spin_lock_init(&sas_ha->state_lock); 93 94 error = sas_register_phys(sas_ha); 95 if (error) { 96 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error); 97 return error; 98 } 99 100 error = sas_register_ports(sas_ha); 101 if (error) { 102 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error); 103 goto Undo_phys; 104 } 105 106 error = sas_init_events(sas_ha); 107 if (error) { 108 printk(KERN_NOTICE "couldn't start event thread:%d\n", error); 109 goto Undo_ports; 110 } 111 112 if (sas_ha->lldd_max_execute_num > 1) { 113 error = sas_init_queue(sas_ha); 114 if (error) { 115 printk(KERN_NOTICE "couldn't start queue thread:%d, " 116 "running in direct mode\n", error); 117 sas_ha->lldd_max_execute_num = 1; 118 } 119 } 120 121 INIT_LIST_HEAD(&sas_ha->eh_done_q); 122 123 return 0; 124 125Undo_ports: 126 sas_unregister_ports(sas_ha); 127Undo_phys: 128 129 return error; 130} 131 132int sas_unregister_ha(struct sas_ha_struct *sas_ha) 133{ 134 unsigned long flags; 135 136 /* Set the state to unregistered to avoid further 137 * events to be queued */ 138 spin_lock_irqsave(&sas_ha->state_lock, flags); 139 sas_ha->state = SAS_HA_UNREGISTERED; 140 spin_unlock_irqrestore(&sas_ha->state_lock, flags); 141 scsi_flush_work(sas_ha->core.shost); 142 143 sas_unregister_ports(sas_ha); 144 145 if (sas_ha->lldd_max_execute_num > 1) { 146 sas_shutdown_queue(sas_ha); 147 sas_ha->lldd_max_execute_num = 1; 148 } 149 150 return 0; 151} 152 153static int sas_get_linkerrors(struct sas_phy *phy) 154{ 155 if (scsi_is_sas_phy_local(phy)) 156 return -EINVAL; 157 158 return sas_smp_get_phy_events(phy); 159} 160 161int sas_phy_enable(struct sas_phy *phy, int enable) 162{ 163 int ret; 164 enum phy_func command; 165 166 if (enable) 167 command = PHY_FUNC_LINK_RESET; 168 else 169 command = PHY_FUNC_DISABLE; 170 171 if (scsi_is_sas_phy_local(phy)) { 172 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 173 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 174 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 175 struct sas_internal *i = 176 to_sas_internal(sas_ha->core.shost->transportt); 177 178 if (!enable) { 179 sas_phy_disconnected(asd_phy); 180 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL); 181 } 182 ret = i->dft->lldd_control_phy(asd_phy, command, NULL); 183 } else { 184 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 185 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 186 ret = sas_smp_phy_control(ddev, phy->number, command, NULL); 187 } 188 return ret; 189} 190 191int sas_phy_reset(struct sas_phy *phy, int hard_reset) 192{ 193 int ret; 194 enum phy_func reset_type; 195 196 if (hard_reset) 197 reset_type = PHY_FUNC_HARD_RESET; 198 else 199 reset_type = PHY_FUNC_LINK_RESET; 200 201 if (scsi_is_sas_phy_local(phy)) { 202 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 203 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 204 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 205 struct sas_internal *i = 206 to_sas_internal(sas_ha->core.shost->transportt); 207 208 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 209 } else { 210 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 211 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 212 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 213 } 214 return ret; 215} 216 217int sas_set_phy_speed(struct sas_phy *phy, 218 struct sas_phy_linkrates *rates) 219{ 220 int ret; 221 222 if ((rates->minimum_linkrate && 223 rates->minimum_linkrate > phy->maximum_linkrate) || 224 (rates->maximum_linkrate && 225 rates->maximum_linkrate < phy->minimum_linkrate)) 226 return -EINVAL; 227 228 if (rates->minimum_linkrate && 229 rates->minimum_linkrate < phy->minimum_linkrate_hw) 230 rates->minimum_linkrate = phy->minimum_linkrate_hw; 231 232 if (rates->maximum_linkrate && 233 rates->maximum_linkrate > phy->maximum_linkrate_hw) 234 rates->maximum_linkrate = phy->maximum_linkrate_hw; 235 236 if (scsi_is_sas_phy_local(phy)) { 237 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 238 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 239 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 240 struct sas_internal *i = 241 to_sas_internal(sas_ha->core.shost->transportt); 242 243 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, 244 rates); 245 } else { 246 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 247 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 248 ret = sas_smp_phy_control(ddev, phy->number, 249 PHY_FUNC_LINK_RESET, rates); 250 251 } 252 253 return ret; 254} 255 256static struct sas_function_template sft = { 257 .phy_enable = sas_phy_enable, 258 .phy_reset = sas_phy_reset, 259 .set_phy_speed = sas_set_phy_speed, 260 .get_linkerrors = sas_get_linkerrors, 261 .smp_handler = sas_smp_handler, 262}; 263 264struct scsi_transport_template * 265sas_domain_attach_transport(struct sas_domain_function_template *dft) 266{ 267 struct scsi_transport_template *stt = sas_attach_transport(&sft); 268 struct sas_internal *i; 269 270 if (!stt) 271 return stt; 272 273 i = to_sas_internal(stt); 274 i->dft = dft; 275 stt->create_work_queue = 1; 276 stt->eh_timed_out = sas_scsi_timed_out; 277 stt->eh_strategy_handler = sas_scsi_recover_host; 278 279 return stt; 280} 281EXPORT_SYMBOL_GPL(sas_domain_attach_transport); 282 283 284void sas_domain_release_transport(struct scsi_transport_template *stt) 285{ 286 sas_release_transport(stt); 287} 288EXPORT_SYMBOL_GPL(sas_domain_release_transport); 289 290/* ---------- SAS Class register/unregister ---------- */ 291 292static int __init sas_class_init(void) 293{ 294 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), 295 0, SLAB_HWCACHE_ALIGN, NULL); 296 if (!sas_task_cache) 297 return -ENOMEM; 298 299 return 0; 300} 301 302static void __exit sas_class_exit(void) 303{ 304 kmem_cache_destroy(sas_task_cache); 305} 306 307MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); 308MODULE_DESCRIPTION("SAS Transport Layer"); 309MODULE_LICENSE("GPL v2"); 310 311module_init(sas_class_init); 312module_exit(sas_class_exit); 313 314EXPORT_SYMBOL_GPL(sas_register_ha); 315EXPORT_SYMBOL_GPL(sas_unregister_ha); 316